I have just come cross a remoting alternative to BlazeDS which is called GraniteDS. Even thought it uses the same core classes it is much more simple and Google is behind that project.
Just as they say now it is so hard to determine if the future of Flex Data Services will be in GraniteDS of BlazeDS. I tried it and it works fine.
I am so happy to see that Google is supporting a commercial product like Flex. It is extremely easy to integrate this open source solution with spring framework. And it is nice to develop POJOs to communicate with remote interfaces. I suggest everyone to try this one, and Google guys... Well done and I hope you can also add data synchronization soon..